| 摘要 |
A set of four cylinders, one of which is displaceable axially makes possible a correct and stable positioning of the edges of a film of plastic material, whilst they are continuously welded, is included in an arrangement for the mfr. of sacks and packets at high speed. Used to produce sacks from film at high speed whilst ensuring the constant alignment of the edges of the film, without displacement or differences in tension which cause faulty welds and sometimes their absence altogether. |
